package com.example.springbootsecurityjwt.configuration;

import com.example.springbootsecurityjwt.filter.JwtAuthenticationTokenFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.access.AccessDeniedHandler;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

/**
 * @program: SpringBoot-Security-JWT
 * @description: Spring-Security配置类
 * @author: Coder_Pan
 * @create: 2022-03-22 10:13
 **/
@Configuration
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityConfig extends WebSecurityConfigurerAdapter {

    private final AuthenticationEntryPoint authenticationEntryPoint;

    private final AccessDeniedHandler accessDeniedHandler;

    public SecurityConfig(JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter, AuthenticationEntryPoint authenticationEntryPoint, AccessDeniedHandler accessDeniedHandler) {
        this.jwtAuthenticationTokenFilter = jwtAuthenticationTokenFilter;
        this.authenticationEntryPoint = authenticationEntryPoint;
        this.accessDeniedHandler = accessDeniedHandler;
    }

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }

    /**
     * 自定义过滤器
     */
    final
    JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问，anonymous()  ==》  如果已登录则不能访问该接口
                .antMatchers("/user/login").anonymous()
                // 除上面外的所有请求全部需要鉴权认证
                .anyRequest().authenticated();


       //把token校验过滤器添加到过滤器链中
       //将 JwtAuthenticationTokenFilter过滤器添加到UsernamePasswordAuthenticationFilter过滤器之前
        http.addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);

        //配置异常处理器
        http.exceptionHandling()
                //配置认证失败处理器
                .authenticationEntryPoint(authenticationEntryPoint)
                .accessDeniedHandler(accessDeniedHandler);

        //允许跨域
        http.cors();
    }
}
